Eq test cycle

All modern, powered, sealed subs
have an analog phenomena called group delay (in the digital
world this is often referred to as latency) so to best integrate
sub(s) you must fix that timing issue so the sub lines up in
time with the mains at the crossover frequency area. Since you
cannot remove this inherent delay in the sub you must add this
delay to all the top channels. The PHASE knob on a modern sub
ADDS MORE delay to the sub than its intrinsic approximately
10 msec.
IN A HOME THEATER SYSTEM
you do this by manually setting the speaker distance settings
in the setup menu. Since consumer equipment operates sort of backwards,
when you increase the distance setting of the sub you are adding
delay to all the other channels. (!) I suggest setting all the
speaker distance settings THE SAME and to 7 feet; then add 12
feet to the SUB distance only (so the sub distance now = 19 feet).
Now you have added a bit more than the correct amount of delay
to the REST of the system (the L C R Ls Rs) so you can then properly
use the PHASE KNOB on the sub to FINE TUNE the timing match. This
will give you the best possible impulse response through the entire
system; the imaging and focus should then should be uncanny, and
the bass focused and as tight as possible. Again, if this is done
correctly, even if the subs are behind you, you will NOT localize
them; it will seem as if the bass is playing from the front of
the room, where it belongs, and this is true even if the crossover
frequency is as high as 120 Hz. Heres another audio non
sequiter: people say that bass is non directional.
This is completely wrong. Audio is more or less directional; the
phrase should be bass is NON-LOCALIZABLE because the wavelengths
are so much larger than your head and therefore there is no phase
difference between your ears relative to the wavelength size.
The higher you cross over, the more you MAY localize the bass
IF the timing of the sub is so far off from the mains that it
almost becomes a separate musical event in time. If the timing
is correct you will feel the bass and localize on the harmonics.